#include<stdio.h>
int main(){
	int month;
	printf("please enter a month :\n");
	scanf("%d",&month);
	switch(month){
		case 3:
		case 4:
		case 5:
			printf("%d is spring\n",month);
			break;
		case 6:
		case 7:
		case 8:
			printf("%d is summer\n",month);
			break;
		case 9:
		case 10:
		case 11:
			printf("%d is autumn\n",month);
			break;
		case 12:
		case 1:
		case 2:
			printf("%d is winter\n",month);
			break;
		default:
			printf("error!!!\n");
	}
	return 0;
} 
